If you have a lancer with the legendary jump implant on a pilot, you will know why this mech is underestimated.

The MD can heal the whole team, that is really handy. In team games, without bots. 

And those mines are terribly powerful traps. Cheetah is map dependent, but on certain maps he can really shine.

Oh, with good timing, the Lancer can avoid mines with a jump. 

Yeah, and all those things do not explain why their powerscore is higher than any other. Maybe legacy code?